<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="http://www。haosou.com" method="POST" >
    <button>提交</button>
    </form>

    <p><label for="user">用户名： <input id="user" name="uaer"></label></p>

    <fieldset>
        <legend>注册表单</legend>
    </fieldset>

    <button type="submit">提交</button>
    <button type="reset">重置</button>
    <button type="button">按钮</button>
    <br>
    <br>
    <button type="submit" form="register">提交</button>

</body>
</html>